Plan to replace the wheel bearing hub assemblies on my 98 Chevy Silverado 4WD with Timken assemblies. There are several options on their website and I need to determine if my truck has 2 wheel ABS or 4 wheel ABS. I know it has ABS on front wheels as I have replaced the sensors in the past. The truck has rear drum brakes so am I correct in thinking it most likely only has ABS on the front wheels? I suppose I would find sensors at the rear wheels somewhere if it has ABS on the rear but wondered if someone knew without me having to pull the rear wheels and check. thanks